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Rick
Rick, Factory Authorized Trainer
Category: Small Engine
Satisfied Customers: 8041
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
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17.5 troybilt engine wont start, backfires once in awhile.

Customer Question

17.5 troybilt engine won't start, backfires once in awhile. spark to plug, new sparkplug, new gas filter, new gas, clean air filter , turns over fine, just won't start
Submitted: 4 years ago.
Category: Small Engine
Expert:  Rick replied 4 years ago.
Was there an impact or a sudden stop before this started happening?
Customer: replied 4 years ago.
The lawnmower ran out of gas, put gas in it but it wont start, so chged plug, gas filter, nothing
Expert:  Rick replied 4 years ago.
Does it try to start if you squirt a tablespoon of gas in the spark plug hole?
Customer: replied 4 years ago.
No, it grinds maybe back fire but does not try to start. I sprayed starting fluid in spark plug hole will not start but plug is usually wet when I remove it again. but it will spark out of the hole.
Expert:  Rick replied 4 years ago.

It sounds like a sheared flywheel key since you're getting spark and it's backfiring. A sheared key would throw it out of time. The other thing I would check for would be a stuck valve. Do you feel compression at the spark plug hole with your thumb when the engine is turning over?

 

 

Customer: replied 4 years ago.
Yes there is compression at the hole with the spark plug out
Expert:  Rick replied 4 years ago.
Then I would check the flywheel key. Odds are that it's sheared.
Customer: replied 4 years ago.
where in the world is the flywheel key
Expert:  Rick replied 4 years ago.

Believe it or not -- in the flywheel. Innocent

 

You remove the flywheel nut and washer to do an inspection. If you can let me know what engine is on there (model, type/spec, code/serial) I should be able to get a drawing to post for you. Here's some good info that may help.

 

http://outdoorpowerinfo.com/repairs/flywheel_removal.asp

 

Rick, Factory Authorized Trainer
Category: Small Engine
Satisfied Customers: 8041
Experience: Outdoor Power Equipment technical trainer since 1990, covering eight states.
Rick and other Small Engine Specialists are ready to help you
Customer: replied 4 years ago.
17.5 1/c overhead valve 5BSXS.5012VP 276016
Expert:  Rick replied 4 years ago.

There should be a model, type, and code. Those numbers are for EPA emissions.

 

http://www.jackssmallengines.com/briggs_and_stratton_model_locator.cfm

 

Customer: replied 4 years ago.
13AN779G766
Customer: replied 4 years ago.
I am sorry, I had an emergency.,that is why you didn't here from me. I will pay you for all your trouble but now I have to find it's location. Thanks
Customer: replied 4 years ago.
I am sorry, I had an emergency.,that is why you didn't here from me. I will pay you for all your trouble but now I have to find it's location. Thanks

Expert:  Rick replied 4 years ago.

Understood. Let me know when you would like to continue...

 

Here's a parts list for your engine to show you how everything goes together.

 

http://www.partstree.com/parts/?lc=Briggs+and+Stratton&mn=31C707-0154-E1

 

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